A black and blue mark that comes from someone sucking on your skin in the passionate throes of lust. Often embarrassing and easy to spot, especially on pale skin. Can be covered up by wearing turtlenecks and scarves.

Guy 1: "Lauren is so stylish... she always wears scarves and turtlenecks even when it is 90 degrees outside"
Guy 2: "That's because she's always covered in hickies from all of the hot guys she is messing with"
Guy 1: "Boy, I wish I was hot enough to give her a hicky. She is way out of my league."